Finding the Fourth Proportional to 518,604, 715,673.52 and 280,140

Step by Step Solution

1. Step 1: Write the proportion equation
   518,604 : 715,673.52 = 280,140 : x
2. Step 2: Convert to fraction form
   518,604/715,673.52 = 280,140/x
3. Step 3: Cross multiply
   518,604x = 715,673.52 × 280,140
4. Step 4: Simplify right side
   518,604x = 200,488,779,892.80
5. Step 5: Solve for x
   x = 200,488,779,892.80/518,604
6. Step 6: Final answer
   x = 386,593.20